Pneumatic hub bearing assembly

Abstract

An air inflation hub bearing assembly comprises a rotary sealing assembly and a hub bearing connected therewith, the hub bearing comprising a hub outer ring and a hub flange, the rotary sealing assembly comprising a static sealing ring cover and a dynamic sealing ring cover, the static sealing ring cover being provided with an air inlet channel, the dynamic sealing ring cover being provided with an air outlet channel, and a sealing assembly being arranged between the static sealing ring cover and the dynamic sealing ring cover, the sealing assembly comprising a static sealing ring fixed to the static sealing ring cover and a dynamic sealing ring fixed to the dynamic sealing ring cover, the static sealing ring and the dynamic sealing ring abutting against each other through interference contact to achieve dynamic sealing. The present application has the beneficial effect that through the interference contact of the static sealing ring and the dynamic sealing ring, dynamic sealing is achieved when the hub bearing rotates, effectively solving the problem that the traditional air inflation hub bearing is prone to air leakage during high-speed or long-term use, thereby improving air tightness, ensuring stable tire air pressure, and improving vehicle safety, fuel efficiency and equipment life.

Description

Technical Field

[0001] This invention relates to a wheel hub bearing, and more particularly to a pneumatic wheel hub bearing assembly. Background Technology

[0002] The valve core, as the core component of a tire inflation / deflation system, is widely used in tires of various vehicles such as automobiles, bicycles, and motorcycles. Its main applications include routine tire pressure maintenance, pre-long-distance driving checks and adjustments, and pressure optimization under specific conditions, such as off-road driving or load changes. The process typically involves: during inflation, aligning the connector of an external inflation device (such as an air pump) with the valve core and pressing it down. The pressure difference forces the internal valve core to open, allowing air to flow into the tire cavity. During deflation, a tool or by directly pressing the valve core at the top of the valve core releases internal air to reduce the pressure. The valve core is usually independently mounted on the inflation port of the wheel hub, relying on threaded fixing and rubber seals to ensure airtightness under static conditions. This design is simple and inexpensive, but requires manual operation and cannot achieve automated or integrated control.

[0003] However, since wheel bearings are in a rotating state for most of the time during use, achieving an airtight seal during rotation is quite difficult. Therefore, the inflation and deflation devices on existing tires are independent of the wheel bearings. But in scenarios requiring more frequent inflation and deflation, such as off-road vehicles needing to adjust traction in real time when driving on sand or mud, racing cars dynamically optimizing tire pressure based on track conditions during races, or agricultural machinery needing to reduce pressure to prevent sinking in soft soil, wheel bearings with inflation and deflation functions have appeared on the market to meet these needs. However, existing wheel bearings with inflation and deflation functions have poor airtightness and are prone to leakage during high-speed rotation or long-term use, leading to unstable tire pressure and affecting vehicle safety, fuel efficiency, and equipment lifespan. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides an air-filled wheel hub bearing assembly that solves the problems of poor air tightness and easy air leakage when the wheel hub bearing rotates.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: an inflatable wheel hub bearing assembly, comprising a rotary sealing assembly and a wheel hub bearing connected thereto, the wheel hub bearing comprising a wheel hub outer ring and a wheel hub flange that can rotate relative to each other, the rotary sealing assembly comprising a static sealing ring cover fixed to the wheel hub outer ring and a dynamic sealing ring cover fixed to the wheel hub flange, the static sealing ring cover being provided with an air inlet channel connected to an external air supply source, the dynamic sealing ring cover being provided with an air outlet channel connected to the inside of the tire, a sealing assembly being provided between the static sealing ring cover and the dynamic sealing ring cover, the sealing assembly being used to achieve an airtight seal at the connection between the static sealing ring cover and the dynamic sealing ring cover, the sealing assembly comprising a static sealing ring fixed to the static sealing ring cover and a dynamic sealing ring fixed to the dynamic sealing ring cover, the static sealing ring and the dynamic sealing ring abutting against each other through interference contact to achieve a dynamic seal.

[0006] The beneficial effects of this invention are as follows: Through the interference contact of the static and dynamic sealing rings, dynamic sealing is achieved during the rotation of the wheel hub bearing, effectively solving the problem of easy air leakage in traditional pneumatic wheel hub bearings during high-speed or long-term use. This improves airtightness, ensures stable tire pressure, and enhances vehicle safety, fuel efficiency, and equipment lifespan. This structure utilizes the tight fit between relatively rotating components to prevent gas leakage, simplifying the sealing design and enhancing adaptability to rotational conditions. As a preferred embodiment, the sealing assembly can employ a double-lip sealing ring structure, where the static sealing ring is made of an elastic material and has inwardly and outwardly extending lips, and the dynamic sealing ring is a hard metal ring with a smooth contact surface. During assembly, the two rings generate initial pressure through a preset interference fit. During rotation, the lips can adjust accordingly to compensate for wear and thermal deformation, maintaining a continuous seal. As another preferred embodiment, the sealing assembly can integrate a spring-assisted system, such as a wave spring on the back of the static sealing ring, to provide additional radial pressure, ensuring that the interference contact does not fail under vibration or impact, thereby enhancing the reliability and durability of the seal.

[0007] Furthermore, the dynamic sealing ring cover is provided with a cover facing the end face of the static sealing ring cover. The cover has a boss at its center, and the air outlet is located at the center of the boss. The outer diameter of the boss is larger than the outer diameter of the air inlet. Arc-shaped notches are symmetrically provided on both sides of the boss. The two ends of the arc-shaped notches are respectively connected to the boss and the cover. The abutment position of the static sealing ring and the dynamic sealing ring is located inside the arc-shaped notches.

[0008] By incorporating a cover, a boss, and an arc-shaped notch, and placing the sealing position within the arc-shaped notch, the layout of the airflow channel and the sealing environment are optimized. The cover provides a physical barrier to prevent external impurities from intruding into the sealing area; the central outlet of the boss ensures concentrated airflow delivery, reducing pressure loss; the symmetrical design of the arc-shaped notch allows the sealing ring to form a continuous sealing line within the notch, wrapping around the connection between the inlet and outlet channels, effectively preventing gas leakage from the connection gap, thereby improving the integrity and reliability of the overall seal. Furthermore, this structure keeps the sealing surface away from direct airflow impact, reducing the risk of wear. As a preferred approach, the arc-shaped notch can be designed as a spiral involute shape, allowing the airflow to smoothly change direction as it passes through, reducing turbulence and localized high pressure, while ensuring the sealing ring is evenly compressed along the notch contour, avoiding seal failure caused by stress concentration. Alternatively, the cover can integrate guide vanes arranged along the edge of the arc-shaped notch to guide the airflow smoothly and assist in heat dissipation, thereby reducing the impact of thermal effects on the sealing material and extending its service life.

[0009] Furthermore, the dynamic sealing ring is respectively attached to the two arc-shaped notches and is adapted to the shape of the arc-shaped notches.

[0010] The dynamic sealing ring conforms to the curved notch and its shape, ensuring continuity and consistency of the sealing contact surface and reducing gaps or leakage points caused by shape mismatch. This fitting design allows the dynamic sealing ring to closely follow the notch contour during rotation, maintaining stable contact pressure, improving sealing efficiency, and simplifying the assembly process while reducing installation errors. It also enhances the sealing ring's resistance to displacement, preventing it from falling out of position under dynamic operating conditions. As a preferred option, the dynamic sealing ring can employ a layered composite material structure, with an outer layer of wear-resistant rubber molded into a curved surface precisely matching the notch, and an inner layer of metal reinforcement skeleton to provide rigid support, adapting to minute manufacturing tolerances through elastic deformation during fitting. As another preferred option, the contact surface of the dynamic sealing ring can be machined with fine textures or oil reservoirs to capture lubricant and form a uniform oil film during rotation, thereby reducing the coefficient of friction and wear rate and maintaining long-term sealing performance.

[0011] Furthermore, the static sealing rings are symmetrically arranged on both sides of the static sealing ring cover facing the dynamic sealing ring cover. The static sealing ring includes a skeleton fixed to the static sealing ring cover and a sealing lip fixed to the skeleton. The sealing lip includes two contact parts, which extend from both axial sides of the skeleton toward the dynamic sealing ring and respectively form an interference contact with the dynamic sealing ring.

[0012] The static sealing ring is symmetrically arranged and includes a skeleton and a sealing lip. The two contact points form an interference fit with the dynamic sealing ring, achieving a double seal and significantly enhancing the sealing effect and fault tolerance. This structure provides independent sealing barriers on both axial sides, effectively coping with internal pressure fluctuations or external environmental pressure changes, preventing gas leakage from either direction and improving system robustness. The skeleton provides a stable mounting base, and the elastic design of the sealing lip ensures adaptive adjustment of contact pressure. As a preferred option, the two contact points of the sealing lip can be designed with V-shaped or U-shaped cross-sections to increase the contact area and elastic deformation range. Under pressure, the lip can expand outward or inward, thus tightly fitting the dynamic sealing ring. Alternatively, the skeleton can have ventilation channels to balance the internal and external pressures within the sealing area, reducing the load on the sealing lip. The sealing lip material can be selected as ozone-resistant and aging-resistant synthetic rubber to withstand high temperatures and harsh environments.

[0013] Furthermore, the contact portion located on the inner side of the skeleton in the axial direction extends radially upward from the connection point with the skeleton toward the dynamic sealing ring, while the contact portion located on the outer side of the skeleton in the axial direction extends radially downward from the connection point with the skeleton toward the dynamic sealing ring.

[0014] The radial extension direction of the contact portion optimizes the behavior of the sealing lip under pressure, enabling the seal to adapt to changes in internal and external pressure. The radially upward-facing contact portion fits more tightly against the dynamic sealing ring under internal high pressure, while the radially downward-facing contact portion enhances the seal under external high pressure or impurity intrusion. This directional response improves the reliability and specificity of the seal, reducing the risk of leakage. It also helps to distribute sealing stress and extend lip life. As a preferred approach, the extension angle of the contact portion can be optimized based on typical operating pressure ranges; for example, the upward extension can be set at an acute angle to the horizontal plane, and the downward extension at an obtuse angle, to balance sealing force and wear rate. Alternatively, a secondary lip or flange can be added to the end of the contact portion to form a labyrinth seal structure, further preventing gas penetration and contaminant entry, enhancing overall protection.

[0015] Furthermore, the skeleton is fixed to at least two surfaces of the static sealing ring cover facing the end face of the dynamic sealing ring cover.

[0016] The skeleton is fixed to the static sealing ring cover on multiple surfaces, improving the installation stability and vibration resistance of the static sealing ring and preventing loosening or displacement under high-speed rotation or dynamic loads. This multi-point fixing method enhances the connection strength between the skeleton and the static sealing ring cover, ensuring that the sealing lip always remains in the designed position, maintaining consistent sealing performance, and reducing leakage caused by structural deformation. It also helps to distribute mechanical stress and extend component life. As a preferred method, the skeleton can be fixed by a combination of clips and bolts, where the clips are embedded in the grooves of the static sealing ring cover for initial positioning, and the bolts pass through the holes in the skeleton and are locked in the threaded holes of the static sealing ring cover, achieving double fixing. As another preferred method, the skeleton can be designed with a structure with wing plates, which fit against the side of the static sealing ring cover and are fixed by welding to increase the contact area and force transmission path, thereby improving overall rigidity.

[0017] Furthermore, the skeleton is at least partially located within the cover.

[0018] The skeleton portion, located within the cover, provides initial protection, effectively preventing external impurities such as mud, water, and dust from directly contacting the skeleton and sealing lip, reducing contamination, corrosion, and wear, thereby extending the lifespan of the sealing assembly. This layout also optimizes space utilization, making the structure more compact and aiding in airflow and heat dissipation. The cover provides an additional barrier to the sealing area, enhancing environmental adaptability. As a preferred option, the cover can be designed as a bowl-shaped structure with an inwardly sloping edge, enclosing the skeleton within it, with a small gap between the edge and the static seal ring cover to allow for thermal expansion, while guide ribs are provided on the inner wall of the cover to guide impurities away from the sealing surface. Alternatively, the portion of the skeleton within the cover can be coated with a hydrophobic coating or covered with a protective sleeve to prevent moisture buildup and chemical corrosion, thereby improving the durability of the sealing material in humid or corrosive environments.

[0019] Furthermore, a flexible air tube is provided at one end of the air outlet facing away from the air inlet, and a threaded connector is connected to the other end of the flexible air tube. The threaded connector is threadedly connected to the flexible air tube, and the other end of the threaded connector is threadedly connected to an external air tube or airway.

[0020] By incorporating flexible tubing and threaded connectors, a flexible and reliable connection method is provided, adapting to the relative motion during wheel hub bearing rotation. The flexible tubing can bend and twist, reducing stress concentration and fatigue damage to the airway system and preventing ruptures or leaks caused by rigid connections. The threaded connectors facilitate installation, disassembly, and maintenance, ensuring airtightness and strength at the connection. This enhances the system's maintainability and adaptability to dynamic operating conditions. As a preferred option, the flexible tubing can be made of braided reinforced rubber tubing, with a smooth inner layer to reduce airflow resistance and an outer braided layer providing tensile and torsional strength. The connector is secured with a crimp ring and sealant for a robust seal. Alternatively, the threaded connector can be designed as a quick-connect with a rotation compensation structure, including a spherical surface and a sealing ring, allowing for a certain angle of deflection without affecting the connection, thereby further reducing stress transmitted during motion.

[0021] Furthermore, an intake pipe is provided at the end of the intake duct facing away from the exhaust duct, a protrusion is provided on the static sealing ring cover, and a pressure plate is provided on the intake pipe and is fixed to the protrusion after passing through the outer ring of the wheel hub by fasteners on the pressure plate.

[0022] The intake pipe is secured to the protrusion on the static sealing ring cover via a pressure plate and fasteners, clamping the outer ring of the wheel hub in the middle, achieving a stable and reliable connection. This fixing method enhances the support strength and vibration resistance of the intake duct, preventing displacement, loosening, or detachment caused by vehicle vibration or external impact, ensuring the stability and sealing of the airflow channel. Simultaneously, it simplifies the assembly process, improving production efficiency and maintenance convenience. As a preferred option, the pressure plate can be designed as a split structure, consisting of two semi-circular plates locked together with bolts, evenly clamping the outer ring of the wheel hub and the protrusion to distribute the fastening force and avoid localized deformation. Alternatively, the protrusion can integrate a guide groove and a limiting step, with a corresponding flange at the end of the intake pipe. During installation, the flange is embedded in the guide groove and pressed tightly by the pressure plate, achieving precise alignment and mechanical interlocking, reducing installation errors. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0025] Figure 3 This is a partial cross-sectional view of the sealing assembly in an embodiment of the present invention;

[0026] Figure 4 This is a partial cross-sectional view of the dynamic sealing ring cover facing the end face of the static sealing ring cover according to an embodiment of the present invention;

[0027] Figure 5 This is a partial cross-sectional view of the pressure plate in an embodiment of the present invention. Detailed Implementation

[0028] An embodiment of the present invention provides an inflatable wheel hub bearing assembly as follows: Figure 1-5 As shown: This includes a rotary sealing assembly 1 and a hub bearing 2 connected thereto. The hub bearing 2 is prior art, mainly comprising a hub outer ring 21 and a hub flange 22. The two are able to rotate relative to each other through internal rolling elements and other structures. The hub flange 22 is used to connect the wheel. A spline 23 is provided on the inner side of the hub bearing 2 for connection to a transmission mechanism.

[0029] The rotary sealing assembly 1 is the core improvement of this invention. Its function is to establish a dynamic, airtight air-filling channel between the stationary outer ring 21 of the hub and the rotating hub flange 22. The rotary sealing assembly 1 mainly includes a static sealing ring cover 11 fixed to the outer ring 21 of the hub, a dynamic sealing ring cover 12 fixed to the hub flange 22, and a sealing assembly 13 disposed between the two. The static sealing ring cover 11 is provided with an air inlet 111 connected to an external air supply source, and the dynamic sealing ring cover 12 is provided with an air outlet 121 connected to the inside of the tire. Several air outlets 121 are arranged circumferentially on the dynamic sealing ring cover 12, and when there is relative movement between the dynamic sealing ring cover 12 and the static sealing ring cover 11, the air inlet 111 and the air outlet 121 are intermittently spliced ​​together. The function of the sealing assembly 13 is to ensure that the connection between the static sealing ring cover 11 and the dynamic sealing ring cover 12 remains airtight when they rotate relative to each other, so that gas can be reliably transmitted from the air inlet 111 to the air outlet 121.

[0030] The sealing assembly 13 includes a static sealing ring 131 fixed to the static sealing ring cover 11 and a dynamic sealing ring 132 fixed to the dynamic sealing ring cover 12. During operation, the static sealing ring 131 and the dynamic sealing ring 132 abut against each other and achieve a contact seal through a precise interference fit design. This is similar to the double-lip seal structure commonly found in bearings, where the stationary static sealing ring 131 and the rotating dynamic sealing ring 132 achieve a dynamic seal on their contact surfaces as the hub bearing 2 rotates.

[0031] Furthermore, a cover 122 is provided on the end face of the dynamic sealing ring cover 12 facing the static sealing ring cover 11. A boss 123 is provided at the center of the cover 122, through which the air outlet 121 passes. The outer diameter of the boss 123 is designed to be larger than the outer diameter of the air inlet 111. Two arc-shaped notches 124 are symmetrically provided on both sides of the boss 123, with each end of the arc-shaped notch 124 connecting to the main body of the boss 123 and the cover 122, respectively. The abutment sealing positions of the static sealing ring 131 and the dynamic sealing ring 132 are precisely located within the space formed by these two arc-shaped notches 124, effectively enclosing the connection area of ​​the air inlet 111 and the air outlet 121, providing a good sealing environment.

[0032] Specifically, the dynamic sealing ring 132 is respectively attached to the surface of the two arc-shaped notches 124, and its shape is adapted to the shape of the arc-shaped notches 124 to ensure good fit and support.

[0033] The static sealing ring 131 is symmetrically arranged on both sides of the end face of the static sealing ring cover 11 facing the dynamic sealing ring cover 12. The static sealing ring 131 mainly includes a skeleton 1311 made of metal or other rigid material, and an elastic sealing lip 1312 fixed on the skeleton 1311. The sealing lip 1312 includes two independent contact portions: a first contact portion 13121 and a second contact portion 13122. The two contact portions extend from the axial inner side and axial outer side of the skeleton 1311, respectively, toward the opposite dynamic sealing ring 132, and finally form an interference contact with the surface of the dynamic sealing ring 132, thereby forming two independent dynamic sealing lines on both axial sides.

[0034] More specifically, the first contact portion 13121, located axially inner to the frame 1311 (i.e., the side closer to the boss 123), extends radially upward (i.e., inclined towards the direction of the dynamic sealing ring 132) from its connection point with the frame 1311. The second contact portion 13122, located axially outer to the frame 1311 (i.e., the side away from the boss 123), extends radially downward (i.e., inclined away from the direction of the intake duct 111) from its connection point towards the dynamic sealing ring 132. This design allows the first contact portion 13121 to be pushed against the dynamic sealing ring 132 by pressure when facing high air pressure that may be generated inside the sealing cavity (such as the tire side), resulting in a tighter fit; while the second contact portion 13122 can also be pushed against the dynamic sealing ring 132 when facing pressure generated by external mud, water, dust, etc., enhancing external protection.

[0035] To ensure a more secure fixation of the static sealing ring 131, the skeleton 1311 is fixed to at least two surfaces of the static sealing ring cover 11 facing the dynamic sealing ring cover 12, for example, by simultaneously fixing it to the radial and axial surfaces through interference fit or bonding. Furthermore, at least a portion of the skeleton 1311 is located inside the cover 122 of the dynamic sealing ring cover 12, thus providing preliminary shielding protection for this portion of the skeleton 1311 and the root of the sealing lip 1312, blocking most of the splashed mud and impurities.

[0036] Regarding the connection of the air outlet duct, a flexible air tube 31 is connected to one end of the air outlet duct 121 facing away from the air inlet duct 111. A threaded connector 32 is connected to the other end of the flexible air tube 31, and the two are connected by threads. The other end of the threaded connector 32 is used for threaded connection to the valve stem leading to the tire or other external air pipes. The use of the flexible air tube 31 can accommodate the slight deformation or displacement that occurs when the wheel hub flange 22 rotates, minimizing the impact on the sealing of the internal air passages.

[0037] Regarding the connection of the air intake duct, the end of the air intake duct 111 facing away from the air outlet duct 121 is connected to the air intake pipe 41, and a sealing ring 411 is provided at the connection between the air intake duct 111 and the air intake pipe 41. A protrusion 112 is provided on the static sealing ring cover 11, and a threaded sleeve 1121 is provided in the protrusion 112 corresponding to the fastener 43. During installation, a pressure plate 42 is fitted onto the air intake pipe 41, and then fasteners such as screws are used to pass through the pressure plate 42 and the corresponding mounting holes on the outer ring 21 of the wheel hub in sequence, and finally screwed into the threaded hole of the protrusion 112. In this way, the outer ring 21 of the wheel hub is firmly clamped between the pressure plate 42 and the protrusion 112 of the static sealing ring cover 11, realizing a stable connection between the static sealing ring cover 11 and the outer ring 21 of the wheel hub.

[0038] The working principle of this invention is as follows: When tire inflation is required, an external air source is connected through the air intake pipe 41. The gas flows sequentially through the air intake pipe 41, the air intake passage 111 on the static sealing ring cover 11, and enters the cavity sealed by the static sealing ring 131 and the dynamic sealing ring 132. Under the effective dynamic sealing of the sealing assembly 13, the gas can reliably pass through the sealed cavity regardless of whether the wheel hub bearing 2 rotates, and then enters the air outlet passage 121 on the dynamic sealing ring cover 12. Subsequently, the gas is finally introduced into the tire through the flexible air tube 31 and the threaded joint 32, completing the inflation process. Throughout the process, the relative movement between the stationary parts (static sealing ring cover 11, static sealing ring 131) and the rotating parts (dynamic sealing ring cover 12, dynamic sealing ring 132) is effectively isolated by the sealing assembly 13, ensuring the continuous sealing of the inflation channel.

[0039] The above embodiments are merely one preferred embodiment of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included within the protection scope of the present invention.

Claims

1. An inflatable wheel hub bearing assembly, comprising a rotary sealing assembly and a wheel hub bearing connected thereto, the wheel hub bearing comprising a wheel hub outer ring and a wheel hub flange that are rotatable relative to each other, the rotary sealing assembly comprising a static sealing ring cover fixed to the wheel hub outer ring and a dynamic sealing ring cover fixed to the wheel hub flange, the static sealing ring cover having an air inlet channel connected to an external air supply source, the dynamic sealing ring cover having an air outlet channel connected to the inside of the tire, and a sealing assembly being provided between the static sealing ring cover and the dynamic sealing ring cover, characterized in that: The sealing assembly is used to achieve an airtight seal at the connection between the static sealing ring cover and the dynamic sealing ring cover. The sealing assembly includes a static sealing ring fixed to the static sealing ring cover and a dynamic sealing ring fixed to the dynamic sealing ring cover. The static and dynamic sealing rings abut against each other through an interference fit to achieve a dynamic seal. A cover is provided on the end face of the dynamic sealing ring cover facing the static sealing ring cover. A boss is provided at the center of the cover, and the air outlet is located at the center of the boss. The outer diameter of the boss is larger than the outer diameter of the air inlet. Symmetrically arranged arc-shaped notches are provided on both sides of the boss. The two ends of the arc-shaped notches are respectively connected to the boss and the cover. The abutment position of the static and dynamic sealing rings is located within the arc-shaped notches. The dynamic sealing rings are respectively fitted onto the two arc-shaped notches and are aligned with the arc-shaped notches. The shape of the notch is adapted to the shape of the static sealing ring; the static sealing ring is symmetrically arranged on both sides of the static sealing ring cover facing the end face of the dynamic sealing ring cover. The static sealing ring includes a skeleton fixed to the static sealing ring cover and a sealing lip fixed to the skeleton. The sealing lip includes two contact parts, which extend from both axial sides of the skeleton toward the dynamic sealing ring and respectively form an interference contact with the dynamic sealing ring. The contact part located on the inner side of the skeleton extends radially upward toward the dynamic sealing ring from the connection point with the skeleton, and the contact part located on the outer side of the skeleton extends radially downward toward the dynamic sealing ring from the connection point with the skeleton. The skeleton is fixed to at least two surfaces of the static sealing ring cover facing the end face of the dynamic sealing ring cover. The skeleton is at least partially located inside the cover.

2. The pneumatic wheel hub bearing assembly according to claim 1, characterized in that: A flexible air tube is provided at one end of the air outlet facing away from the air inlet. The other end of the flexible air tube is connected to a threaded connector. The threaded connector is threaded to the flexible air tube, and the other end of the threaded connector is threaded to an external air tube or airway.

3. The pneumatic wheel hub bearing assembly according to claim 1, characterized in that: An intake pipe is provided at one end of the air intake duct facing away from the air outlet duct. A protrusion is provided on the static sealing ring cover. A pressure plate is provided on the intake pipe and is fixed to the protrusion after passing through the outer ring of the wheel hub by fasteners on the pressure plate.

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